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Restructuring and Other Charges - Summary of Restructuring by Major Type of Restructuring Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jul. 01, 2016 | Jun. 30, 2017 | Jul. 01, 2016
Restructuring Charges [Line Items] |  |  |  |
Restructuring costs | $ 9,454 | $ 32,920 | $ 92,061 | $ 136,671
Lease Abandonments |  |  |  |
Restructuring Charges [Line Items] |  |  |  |
Restructuring costs | 2,712 | 10,300 | 47,313 | 74,571
Involuntary Terminations |  |  |  |
Restructuring Charges [Line Items] |  |  |  |
Restructuring costs | 4,120 | 20,359 | 32,606 | 58,648
Outside Services |  |  |  |
Restructuring Charges [Line Items] |  |  |  |
Restructuring costs | 684 | 2,076 | 4,236 | 3,267
Other Restructuring Related |  |  |  |
Restructuring Charges [Line Items] |  |  |  |
Restructuring costs | $ 1,938 | $ 185 | $ 7,906 | $ 185

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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